（！！！公告！！！）正则表达式专用讨论区（精华）

[heavenkiller]

我来提第一个问题！
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请看下面一段代码：
string word="!!heaven!killer aaa!";
//string word="!!";
string strReg=@"!\S*!";//pick max character?
Regex r=new Regex(strReg);
Match m=r.Match(word);
Console.WriteLine("Is Matched:"+m.Success.ToString());
for(int i=0;i<m.Groups.Count;i++)
{
Console.WriteLine("Groups["+i+"] value"+m.Groups[i].Value);
for(int j=0;j<m.Groups[i].Captures.Count;j++)
{
Console.WriteLine(m.Groups[i].Captures[j].Value);
}
}

应该有两个匹配!!和!!heaven!,但为什么只有!!heaven!　呢　　？

[heavenkiller]

第二个问题：
$是怎样用的，能否用完整的代码举个例子？

[saucer]

"*" is greedy, it will grab anything it can, try to use "*?", also, once it matches "!..!", it will start from the character the last "!", so in your case, even if you use "!\S*?!", it will not match "heaven", also, you need to use Matches, also see an example for "$":

string[] slist ={"!!heaven!killer aaa!", "!!!heaven!!ddkiller aaa!", "abc"};
//string word="!!";
string strReg=@"!\S*?!";//pick max character?

Regex r=new Regex(strReg);
foreach (string word in slist)
{
MatchCollection mc=r.Matches(word);
Console.WriteLine("{0} matches: {1}", word, mc.Count > 0);
foreach (Match m in mc)
Console.WriteLine(m.Value);
}

r = new Regex("[^!]+!$");
foreach (string word in slist)
{
MatchCollection mc=r.Matches(word);
Console.WriteLine("{0} matches: {1}", word, mc.Count > 0);
foreach (Match m in mc)
Console.WriteLine(m.Value);
}